This afternoon at work, I was just sitting at my desk using my computer when my screen went black and it displayed the message, "No signal detected." The fan on my computer was still running, but nothing was happening! There wasn't any noise or anything...the screen just went black. I tried hitting control-alt-delete, but that didn't work, either! I went to my co-worker Kitty and the same thing had just happened to her. She called one of the computer people and they said that one of the phases (?) went out. Evidently, we have three. Some (but not all) lights also went out, and the fire alarms were beeping, like they were in test mode, so it wasn't too loud.